Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| 1 |
Amazon
AMZN
|
$144M |
| 2 |
Invesco QQQ Trust
QQQ
|
$68.7M |
| 3 |
AT&T
T
|
$45.5M |
| 4 |
Meta Platforms (Facebook)
META
|
$38M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
$35.4M |
Top Sells
| 1 |
Microsoft
MSFT
|
$94.2M |
| 2 |
Citigroup
C
|
$62.3M |
| 3 |
JPMorgan Chase
JPM
|
$56.2M |
| 4 |
Berkshire Hathaway Class B
BRK.B
|
$45.8M |
| 5 |
SPDR Gold Trust
GLD
|
$44.4M |
Sector Composition
| 1 | Consumer Discretionary | 16.85% |
| 2 | Technology | 15.5% |
| 3 | Communication Services | 10.53% |
| 4 | Healthcare | 8.8% |
| 5 | Consumer Staples | 5.63% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
4901
Aldeyra Therapeutics
ALDX
$350M
| – | – |
0
| – | – |
|
4902
Allete
ALE
$3.68B
| – | – |
-32
| Closed | -$1K |
|
4903
Vicor
VICR
$2.27B
| – | – |
0
| – | – |
|
|
CAN
4904
Canaan Creative
CAN
$351M
| – | – |
0
| – | – |
|
|
MOON
4905
DELISTED
Direxion Moonshot Innovators ETF
MOON
| – | – |
-39
| Closed | – |
|
|
CMLS
4906
DELISTED
Cumulus Media Inc. Class A Common Stock
CMLS
| $0 | ﹤0.01% |
+42
| New | – |
|
|
MDC
4907
DELISTED
M.D.C. Holdings, Inc.
MDC
| $0 | ﹤0.01% |
+4
| New | – |
|
|
CASA
4908
DELISTED
Casa Systems, Inc. Common Stock
CASA
| – | – |
-8,833
| Closed | -$27K |
|